A magnitude-6.1 earthquake has killed at least 398 people, injured more than 1,800 others, destroyed more than 12,000 homes, forced the evacuation of more than 230,000 people and impacted more than 1 million people in southwestern China.

Search and rescue teams continued to comb through the wreckage Monday, particularly in impoverished Ludian County, where unstable homes made of mostly wood and earth were toppled by the strong shaking, Xinhua reports. According to Xinhua, 90 percent of such homes were destroyed by the quake.

Dozens of survivors were pulled out of the wreckage by emergency personnel.

Relief efforts continued Monday, with more than 2,500 troops flooding into the disaster zone. The Chinese Government activated a "Grade I" disaster relief response Monday, the highest such response reserved for "especially major disasters" that kill more than 200 or force the evacuations of more than 1 million people, Xinhua notes. Thousands of other necessary supplies like tents were also sent to the area by the Chinese government.

But relief efforts are hitting a snag. Wet weather in the region is making a mess of recovery efforts and could last for days.

Many of the roads in and out of remote towns and villages have also been compromised by the earthquake, making travel to and from some of the areas hit the hardest by the quake extremely difficult.

The death toll is expected to climb once soldiers and relief workers finally access those areas.